#ifndef __SHA1_H__
#define __SHA1_H__

#ifdef __cplusplus
extern "C" {
#endif
    
#include <stdint.h>
/*
* If you do not have the ISO standard stdint.h header file, then you
* must typdef the following:
*    name              meaning
*  uint32_t         unsigned 32 bit integer
*  uint8_t          unsigned 8 bit integer (i.e., unsigned char)
*  int_least16_t    integer of >= 16 bits
*
*/

#ifndef _SHA_enum_
#define _SHA_enum_
enum
{
	shaSuccess = 0,
	shaNull,            /* Null pointer parameter */
	shaInputTooLong,    /* input data too long */
	shaStateError       /* called Input after Result */
};
#endif
#define SHA1HashSize 20

/*
*  This structure will hold context information for the SHA-1
*  hashing operation
*/
typedef struct SHA1Context
{
	uint32_t Intermediate_Hash[SHA1HashSize / 4]; /* Message Digest  */

	uint32_t Length_Low;            /* Message length in bits      */
	uint32_t Length_High;           /* Message length in bits      */

									/* Index into message block array   */
	int_least16_t Message_Block_Index;
	uint8_t Message_Block[64];      /* 512-bit message blocks      */

	int Computed;               /* Is the digest computed?         */
	int Corrupted;             /* Is the message digest corrupted? */
} SHA1Context;

/*
*  Function Prototypes
*/
int SHA1Reset(SHA1Context *);
int SHA1Input(SHA1Context *,
	const uint8_t *,
	unsigned int);
int SHA1Result(SHA1Context *,
	uint8_t Message_Digest[SHA1HashSize]);

int SHA1(const uint8_t *message, 
	unsigned int length,
	uint8_t digest[SHA1HashSize]);

#ifdef __cplusplus
}
#endif

#endif //__SHA1_H__
    




